Hermle 451-053 has stopped chiming. I bought the movement in 2004 and built a case for it. It has worked well until now. On the quarter hour, the chime locking cam will turn 1/8 to 1/4 of a turn and stall. If I help it, it will turn the rest of the way and chime. I cleaned the movement in clock wash solution (without disassembly), oiled it and no significant change. When should the air governor start spinning? It will spin a couple of times about 5 minutes before the hour, then stop. It will begin spinning again right at the quarter hour. Any advice is much appreciated. I am a rank amateur at this.
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